RichThesaurus
cold as a mackerel
vs
cold enough to freeze the balls off a brass monkey
cold as a mackerel
adj
Very cold (in temperature, emotionally, etc.).
Completely unconscious.
cold enough to freeze the balls off a brass monkey
adj
Extremely cold.
How often have the words
cold as a mackerel
and
cold enough to freeze the balls off a brass monkey
occurred in a corpus of books?
(source:
Google Ngram Viewer
)